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Livestock grazing impacts upon components of the breeding productivity of a common upland insectivorous passerine: results from a long-term experiment

Lookup NU author(s): Lisa Malm, Professor Darren Evans

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

The intensity of pastoral management in areas of High Nature Value farming is declining in some regions of Europe but increasing in others. This affects open habitats of conservation concern, such as the British uplands, where bird species that benefit from low-intensity grazing may be most sensitive to such polarisation. While experimental manipulations of livestock grazing intensities have improved our understanding of upland breeding bird responses in the short-term, none have examined the longer-term impacts of altered management on reproductive success. Using a replicated landscape-scale experiment that started in 2003, we investigated the effects of four grazing treatments (intensive sheep; low-intensity sheep; low-intensity mixed sheep and cattle; and no grazing) on the breeding productivity of meadow pipits Anthus pratensis, the most common upland passerine. Surveys were carried out systematically during early (2003 & 2004) and later (2015 & 2016) sampling periods of the experiment to compare the short and longer-term effects of grazing treatments on breeding density and productivity of pipits specifically, but also on the overall bird community. Pipit breeding density was lowest under low-intensity sheep grazing while the highest egg-stage nest survival was observed in the same treatment, although no significant treatment effects were detected on overall nest survival or fledgling output. There were no significant differences in treatment effects between the sampling periods on any breeding variable, but overall nest survival was lower in the later sampling period across all treatments. Breeding bird species richness differed between treatments in the later sampling period, with highest species richness in the ungrazed treatment. Synthesis and application. Livestock grazing management can have different outcomes for different upland birds. With time, meadow pipit breeding productivity tends to be higher when sheep grazing intensity is reduced and/or mixed with cattle, and lower when livestock are removed, but not significantly so. Removal of grazing, however, can significantly increase bird species richness. The long-term experiment showed an overall decline in fledglings regardless of grazing treatments, potentially a result of increased predator numbers harboured by nearby developing woodland, highlighting the importance of considering wider landscape processes in grazing management decisions.


Publication metadata

Author(s): Malm LE, Pearce-Higgins JW, Littlewood NA, Karley AJ, Karaszewska E, Jaques R, Pakeman RJ, Redpath SM, Evans DM

Publication type: Article

Publication status: Published

Journal: Journal of Applied Ecology

Year: 2020

Volume: 57

Issue: 8

Pages: 1514-1523

Print publication date: 01/08/2020

Online publication date: 31/05/2020

Acceptance date: 06/04/2020

Date deposited: 20/04/2020

ISSN (print): 0021-8901

ISSN (electronic): 1365-2664

Publisher: Wiley-Blackwell Publishing Ltd.

URL: https://doi.org/10.1111/1365-2664.13647

DOI: 10.1111/1365-2664.13647

Data Source Location: https://doi.org/10.5061/dryad.9zw3r22bd


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